CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME (USD $) In Thousands	Total	Common Stock	Paid-in- Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Comprehensive Income
Beginning Balance at Sep. 30, 2011	$ 465,494	$ 371	$ 1,098,388	$ (1,627,180)	$ 1,015,624	$ (21,709)
Beginning Balance (in shares) at Sep. 30, 2011		37,084
Share-based compensation	9,384		9,384
Exercise of stock options (in shares)		1,355
Exercise of stock options	36,699	14	(5,779)	42,464
Tax effect from share-based payment arrangements	3,160		3,160
Repurchases of common stock (in shares)		(4,352)
Repurchases of common stock	(150,275)	(44)		(150,231)
Issuance of ESPP shares from treasury	9		1	8
Issuance of restricted stock to employees from treasury (in shares)		174
Issuance of restricted stock to employees from treasury	(3,306)	2	(8,751)	5,443
Dividends paid ($0.02 per share)	(1,426)				(1,426)
Net income	50,009				50,009		50,009
Unrealized loss on investments	(8)					(8)	(8)
Cumulative translation adjustments	3,454					3,454	3,454
Ending Balance at Mar. 31, 2012	$ 413,194	$ 343	$ 1,096,403	$ (1,729,496)	$ 1,064,207	$ (18,263)	$ 53,455
Ending Balance (in shares) at Mar. 31, 2012		34,261